11. The exact time taken by the earth for single rotation on its own axis is :

24 hrs

24 hrs 35 sec

23 hrs 50 minutes 7.2 sec

23 hrs 56 minutes 4.09 sec

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12. A black hole is a :

contracted star with intense gravitational pull

star with very low surface temperature

star with no atmosphere

pulsating star

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13. Ursa Minor is :

the name of an island

a group of stars

the name of satellite

the name of a star

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14. Asteroids have their orbits between the planets :

Mercury and Venus

Earth and Mars

Mars and Jupiter

Jupiter and Saturn

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15. Halley's comet appears once in a period of :

24 years

32 years

76 years

84 years

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16. The earth rotates around its axis from :

north to south

east to west

south to north

west to east

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17. The inclination of the earth's axis to the orbital plane is :

21.5 degree

23.5 degree

66.5 degree

90 degree

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18. The speed of rotation of the earth is the highest :

along the Equator

at the North Pole

along the Tropic of Cancer

along the Arctic Circle

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19. Match the following :A. Lithosphere 1. The relatively light rocks that form the continental crustB. Aesthenosphere 2. The relatively dense rocks that form the oceanic crustC. Sima 3. Part of earth's upper mantleD. Sial 4. The outer portion of the earth including the crustBelow options are given in A B C D order

2 3 4 1

3 4 1 2

4 3 2 1

3 2 1 4

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20. Which part of the earth's surface receives the highest amount of insulation?

Tropical deserts

Equatorial region

Savannah region

No such criteria

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21. Tides in the sea have stored in them :

hydraulic energy

kinetic energy

gravitational potential energy

a combination of all the above three forms of energy

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22. In the earliest days when life originated on earth, the atmosphere contained :

free oxygen

no oxygen

oxygen in fixed form

oxygen bound to carbon

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23. Which one of the following would have occurred if the earth had NOT been inclined on its own axis?